Our Savior's response teaches us that the promises found in the psalm are not automatic and unconditional. You shall not tempt the LORD your God, meaning God cannot be forced to act on our behalf. He does not take kindly to humans testing Him to see if He will respond. Save truthful repentance, we will reap what we sow.
Faith remembers truth but also responds emotionally to a wonderful, dynamic, gracious, and powerful Personality who is our Friend. So, all we must do is to follow His lead, and we will find rest from all our burdens in His Kingdom.
The very essence of God is love. Thus, we must make changes in our lives to conform to God's standard so that our prayers will be fully accepted by Him. God expects us to reflect His love in everything we do. And He wants peace.